Malicious PDF — malware analysis report

Static analysis result for SHA-256 75b833696d69bef6…

MALICIOUS

PDF

111.5 KB Created: 2021-03-10 11:14:52 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 589396d372f0c662d6cee658d874d42d SHA-1: 39c4347b159e5eb8e0c51c2a055e2171978d2663 SHA-256: 75b833696d69bef64eb441c4ff4656b968aa8ce59d98d94c6123d885f691f0de
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous external URIs, with one specifically identified as a link farm on disposable hosting, indicating a malicious intent to redirect users. The ML classifier and ClamAV detection strongly suggest this PDF is malicious, likely a phishing lure or a distribution point for further malware. Although no scripts were explicitly extracted, the PDF structure and numerous URLs point towards an attempt to exploit users via external links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://vilenefex.ru/wix?keyword=uthgard+leveling+guide PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4466662/normal_60470cfc829b4.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4443803/normal_5fc5d809954d0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4427780/normal_60187e57d8e9c.pdfIn PDF document text
    • http://litafenedev.22web.org/51909705993.pdfIn PDF document text
    • http://idealica-tufficiale.website/attestation_format_for_signature_difference_cameo3qg3a.pdfIn PDF document text
    • http://makeyourself.xyz/cuantos_pronombres_relativos_hay_en_ingles67fi0.pdfIn PDF document text
    • http://totalcreditcheck.info/gokowatepuvura4q3t7.pdfIn PDF document text
    • http://wiinorama.website/69232539185etmd2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413242/normal_60266b3a534d4.pdfIn PDF document text
    • http://predouche.xyz/52812723614v6t7a.pdfIn PDF document text
    • http://kpovli.ru/picture_editor_app_macs6ie9.pdfIn PDF document text
    • http://ingmijn.com/oxygen_xml_auto_formathvf7c.pdfIn PDF document text
    • http://wirelessinfo.ru/total_bodyworks_5000_workoutsa7h54.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4478146/normal_5fcdab489ab00.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421336/normal_604479d2a35d5.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://2a085669-a8dc-40eb-b1d3-71ea9d660f60.filesusr.com/ugd/cafc24_0121fd48caa842639c04c711b0d33015.pdf?index=trueIn PDF document text
    • http://kuxexulotubi.epizy.com/deductive_argument_forms.pdfIn PDF document text
    • http://forawoxo.epizy.com/entrepreneurship_ideas_in_action_5e.pdfIn PDF document text
    • https://50b7e5d6-ab0e-41ff-bbcb-47d024e5c277.filesusr.com/ugd/45d8ab_660e421f12024e278404b9a25af9e99a.pdf?index=trueIn PDF document text
    • https://2a984544-7cb8-4a4d-9f60-e686f7994e39.filesusr.com/ugd/1434d3_b08a64f82bb045df91d17601da5c0794.pdf?index=trueIn PDF document text
    • https://a3de454e-1598-42bb-a259-4eb69c42f179.filesusr.com/ugd/fb5067_9f2ec3291d4b4d38920e192309671b89.pdf?index=trueIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00016d31.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16D31 4732 bytes
SHA-256: 73b530f31eb1fa6c00d7dea53ef9af5af62b59011dfd7584ca70441871fb329d
font_01_sfnt_off00017d3a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17D3A 11008 bytes
SHA-256: f278d149eac5fe74b8e180f701f47111edcbeebaf0df5916e3ca890b3d2c5872
font_02_sfnt_off0001a2d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A2D3 4324 bytes
SHA-256: a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f

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